Radar device and signal processing method

Abstract

A first module generates a first reception signal from a reflection RF signal of a transmission RF signal using a first local oscillation signal, a second module generates a second reception signal from the reflection RF signal using a second local oscillation signal synchronized with the first local oscillation signal, and a first signal processor calculates the angle of a target using a signal obtained by coherent integration based on the first reception signal and second reception signal.

The invention claimed is: 
     
       1. A radar device comprising:
 a first module for generating a first transmission signal using a first local oscillation signal, transmitting the first transmission signal, receiving a reflection signal of the first transmission signal, and generating a first reception signal from the received reflection signal using the first local oscillation signal; 
 a second module for receiving the reflection signal of the first transmission signal, and generating a second reception signal from the received reflection signal using a second local oscillation signal that is synchronized with the first local oscillation signal; and 
 processing circuitry performing a process of: 
 detecting a target using the first reception signal and calculating an angle of the target using, for the target, a signal obtained by coherent integration based on the first reception signal and the second reception signal. 
 
     
     
       2. The radar device according to  claim 1 , wherein
 the process generates a first signal based on distance and velocity using the first reception signal, detects a distance and a velocity of the target on a basis of an intensity of the first signal, and performs the coherent integration based on the first reception signal and the second reception signal on the detected distance and velocity of the target. 
 
     
     
       3. The radar device according to  claim 2 , wherein
 the process identifies a distance bin number and a velocity bin number of the target on a basis of the intensity of the first signal, and performs the coherent integration based on the first reception signal and the second reception signal on a distance and a velocity corresponding to the distance bin number and the velocity bin number. 
 
     
     
       4. The radar device according to  claim 2 , wherein
 the process performs the coherent integration based on the first reception signal and the second reception signal on a basis of a phase-of-arrival difference caused by a positional relationship between the first module and the second module. 
 
     
     
       5. The radar device according to  claim 1 , wherein
 the process generates a first signal based on a distance and a velocity of the target using the reception signal generated by the first module, performs incoherent integration on the first signal, and detects the target on a basis of an intensity of a signal obtained by the incoherent integration. 
 
     
     
       6. The radar device according to  claim 2 , wherein
 the first module has one or more transmission channels and one or more reception channels, and 
 the process performs coherent integration on the first signal on a basis of a phase difference between channels. 
 
     
     
       7. The radar device according to  claim 1 , further comprising a third module that has a function of transmitting a transmission signal and that generates a third transmission signal using a third local oscillation signal synchronized with the first local oscillation signal, wherein
 the first module receives a reflection signal of the third transmission signal, and generates a third reception signal from the received reflection signal of the third transmission signal using the first local oscillation signal, and 
 the process calculates an angle of the target using, for the target, a signal obtained by coherent integration based on the second reception signal and the third reception signal, or based on the second reception signal, the third reception signal, and the first reception signal. 
 
     
     
       8. The radar device according to  claim 1 , wherein the radar device includes one or more of the second modules. 
     
     
       9. The radar device according to  claim 7 , wherein the radar device includes one or more of the third modules. 
     
     
       10. A radar device comprising:
 a first module for generating a first transmission signal using a first local oscillation signal, transmitting the first transmission signal, receiving a reflection signal of the transmission signal, and generating a first reception signal from the received reflection signal using the first local oscillation signal; 
 a third module for generating a third transmission signal using a third local oscillation signal that is synchronized with the first local oscillation signal; and 
 processing circuitry performing a process of: 
 calculating an angle of a target, wherein 
 the first module receives a reflection signal of the third transmission signal, and generates a third reception signal using the first local oscillation signal, and 
 the process detects the target using the first reception signal, and calculates the angle of the target using, for the target, a signal obtained by coherent integration based on the first reception signal and the third reception signal. 
 
     
     
       11. The radar device according to  claim 6 , wherein
 the first module performs modulation for separating multiple transmission signals into each transmission signal using the first local oscillation signal, and transmits the modulated multiple transmission signals. 
 
     
     
       12. The radar device according to  claim 11 , wherein the modulation is performed by time division, code division, frequency division, time division and code division, or frequency division and code division. 
     
     
       13. The radar device according to  claim 10 , wherein
 the third module performs modulation for separating multiple transmission signals into each transmission signal using the third local oscillation signal, and transmits the modulated multiple transmission signals. 
 
     
     
       14. The radar device according to  claim 13 , wherein the modulation is performed by time division, code division, frequency division, time division and code division, or frequency division and code division. 
     
     
       15. The radar device according to  claim 1 , wherein
 the first module sets a radar parameter on a basis of a loss due to phase noise, and generates the first local oscillation signal. 
 
     
     
       16. A signal processing method for a radar device including a first module that generates a first transmission signal using a first local oscillation signal, transmits the first transmission signal, and receives a reflection signal of the first transmission signal, a second module that receives the reflection signal of the first transmission signal, and a signal processor that calculates an angle of a target, the method comprising:
 generating, by the first module, a first reception signal from the received reflection signal using the first local oscillation signal; 
 generating, by the second module, a second reception signal from the received reflection signal using a second local oscillation signal that is synchronized with the first local oscillation signal; and 
 detecting the target using the first reception signal and calculating the angle of the target using, for the target, a signal obtained by coherent integration based on the first reception signal and the second reception signal. 
 
     
     
       17. A signal processing method for a radar device including a first module that generates a first transmission signal using a first local oscillation signal, transmits the first transmission signal, receives a reflection signal of the first transmission signal, and generates a first reception signal from the received reflection signal using the first local oscillation signal, a third module that generates a third transmission signal using a third local oscillation signal that is synchronized with the first local oscillation signal, and a signal processor that calculates an angle of a target, the method comprising:
 receiving a reflection signal of the third transmission signal and generating a third reception signal using the first local oscillation signal, by the first module; and 
 detecting the target using the first reception signal and calculating the angle of the target using, for the target, a signal obtained by coherent integration based on the first reception signal and the third reception signal. 
 
     
     
       18. The signal processing method according to  claim 16 , wherein
 the first module sets a radar parameter on a basis of a loss due to phase noise, and generates the first local oscillation signal.